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Do I need to use the exact same monitors to run Surround (2D)?

No, they can be different brands. However Surround (2D) mode requires that all three monitors are set to a common resolution, refresh rate, and sync polarity.

For example, you can use two 1680x1050 monitors on the sides and a 1920x1080 monitor as your center display, as long as all three monitors are set to the same resolution (likely 1680x1050 in this example).